Exceptions

There is no limit to the number of daily on-demand backups that can be taken.
Up to 10 simultaneous table operations are allowed per account. These operations include
CreateTable, UpdateTable, DeleteTable,UpdateTimeToLive,
RestoreTableFromBackup, and RestoreTableToPointInTime.
For tables with secondary indexes, only one of those tables can be in the CREATING
state at any point in time. Do not attempt to create more than one such table simultaneously.
The total limit of tables in the ACTIVE state is 250.